objects/clipping.c

   1 /*
   2  * DC clipping functions
   3  *
   4  * Copyright 1993 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <stdlib.h>
  22 #include "windef.h"
  23 #include "wingdi.h"
  24 #include "wownt32.h"
  25 #include "wine/winuser16.h"
  26 #include "gdi.h"
  27 #include "wine/debug.h"
  28
  29 WINE_DEFAULT_DEBUG_CHANNEL(clipping);
  30
  31
  32 /***********************************************************************
  33  *           CLIPPING_UpdateGCRegion
  34  *
  35  * Update the GC clip region when the ClipRgn or VisRgn have changed.
  36  */
  37 void CLIPPING_UpdateGCRegion( DC * dc )
  38 {
  39     if (!dc->hGCClipRgn) dc->hGCClipRgn = CreateRectRgn( 0, 0, 0, 0 );
  40
  41     if (!dc->hVisRgn)
  42     {
  43         ERR("hVisRgn is zero. Please report this.\n" );
  44         exit(1);
  45     }
  46
  47     if (dc->flags & DC_DIRTY) ERR( "DC is dirty. Please report this.\n" );
  48
  49     if (!dc->hClipRgn)
  50         CombineRgn( dc->hGCClipRgn, dc->hVisRgn, 0, RGN_COPY );
  51     else
  52         CombineRgn(dc->hGCClipRgn, dc->hClipRgn, dc->hVisRgn, RGN_AND);
  53     if (dc->funcs->pSetDeviceClipping)
  54         dc->funcs->pSetDeviceClipping( dc->physDev, dc->hGCClipRgn );
  55 }
  56
  57
  58 /***********************************************************************
  59  *           SelectClipRgn    (GDI32.@)
  60  */
  61 INT WINAPI SelectClipRgn( HDC hdc, HRGN hrgn )
  62 {
  63     return ExtSelectClipRgn( hdc, hrgn, RGN_COPY );
  64 }
  65
  66
  67 /******************************************************************************
  68  *              ExtSelectClipRgn        [GDI32.@]
  69  */
  70 INT WINAPI ExtSelectClipRgn( HDC hdc, HRGN hrgn, INT fnMode )
  71 {
  72     INT retval;
  73     DC * dc = DC_GetDCUpdate( hdc );
  74     if (!dc) return ERROR;
  75
  76     TRACE("%p %p %d\n", hdc, hrgn, fnMode );
  77
  78     if (dc->funcs->pExtSelectClipRgn)
  79     {
  80         retval = dc->funcs->pExtSelectClipRgn( dc->physDev, hrgn, fnMode );
  81         GDI_ReleaseObj( hdc );
  82         return retval;
  83     }
  84
  85     if (!hrgn)
  86     {
  87         if (fnMode == RGN_COPY)
  88         {
  89             if (dc->hClipRgn) DeleteObject( dc->hClipRgn );
  90             dc->hClipRgn = 0;
  91             retval = SIMPLEREGION; /* Clip region == whole DC */
  92         }
  93         else
  94         {
  95             FIXME("Unimplemented: hrgn NULL in mode: %d\n", fnMode);
  96             GDI_ReleaseObj( hdc );
  97             return ERROR;
  98         }
  99     }
 100     else
 101     {
 102         if (!dc->hClipRgn)
 103         {
 104             RECT rect;
 105             GetRgnBox( dc->hVisRgn, &rect );
 106             dc->hClipRgn = CreateRectRgnIndirect( &rect );
 107         }
 108
 109         if(fnMode == RGN_COPY)
 110             retval = CombineRgn( dc->hClipRgn, hrgn, 0, fnMode );
 111         else
 112             retval = CombineRgn( dc->hClipRgn, dc->hClipRgn, hrgn, fnMode);
 113     }
 114
 115     CLIPPING_UpdateGCRegion( dc );
 116     GDI_ReleaseObj( hdc );
 117     return retval;
 118 }
 119
 120 /***********************************************************************
 121  *           SelectVisRgn   (GDI.105)
 122  */
 123 INT16 WINAPI SelectVisRgn16( HDC16 hdc16, HRGN16 hrgn )
 124 {
 125     int retval;
 126     HDC hdc = HDC_32( hdc16 );
 127     DC * dc;
 128
 129     if (!hrgn) return ERROR;
 130     if (!(dc = DC_GetDCPtr( hdc ))) return ERROR;
 131
 132     TRACE("%p %04x\n", hdc, hrgn );
 133
 134     dc->flags &= ~DC_DIRTY;
 135
 136     retval = CombineRgn( dc->hVisRgn, HRGN_32(hrgn), 0, RGN_COPY );
 137     CLIPPING_UpdateGCRegion( dc );
 138     GDI_ReleaseObj( hdc );
 139     return retval;
 140 }
 141
 142
 143 /***********************************************************************
 144  *           OffsetClipRgn    (GDI32.@)
 145  */
 146 INT WINAPI OffsetClipRgn( HDC hdc, INT x, INT y )
 147 {
 148     INT ret = SIMPLEREGION;
 149     DC *dc = DC_GetDCUpdate( hdc );
 150     if (!dc) return ERROR;
 151
 152     TRACE("%p %d,%d\n", hdc, x, y );
 153
 154     if(dc->funcs->pOffsetClipRgn)
 155         ret = dc->funcs->pOffsetClipRgn( dc->physDev, x, y );
 156     else if (dc->hClipRgn) {
 157         ret = OffsetRgn( dc->hClipRgn, XLSTODS(dc,x), YLSTODS(dc,y));
 158         CLIPPING_UpdateGCRegion( dc );
 159     }
 160     GDI_ReleaseObj( hdc );
 161     return ret;
 162 }
 163
 164
 165 /***********************************************************************
 166  *           OffsetVisRgn    (GDI.102)
 167  */
 168 INT16 WINAPI OffsetVisRgn16( HDC16 hdc16, INT16 x, INT16 y )
 169 {
 170     INT16 retval;
 171     HDC hdc = HDC_32( hdc16 );
 172     DC * dc = DC_GetDCUpdate( hdc );
 173     if (!dc) return ERROR;
 174     TRACE("%p %d,%d\n", hdc, x, y );
 175     retval = OffsetRgn( dc->hVisRgn, x, y );
 176     CLIPPING_UpdateGCRegion( dc );
 177     GDI_ReleaseObj( hdc );
 178     return retval;
 179 }
 180
 181
 182 /***********************************************************************
 183  *           ExcludeClipRect    (GDI32.@)
 184  */
 185 INT WINAPI ExcludeClipRect( HDC hdc, INT left, INT top,
 186                                 INT right, INT bottom )
 187 {
 188     HRGN newRgn;
 189     INT ret;
 190     DC *dc = DC_GetDCUpdate( hdc );
 191     if (!dc) return ERROR;
 192
 193     TRACE("%p %dx%d,%dx%d\n", hdc, left, top, right, bottom );
 194
 195     if(dc->funcs->pExcludeClipRect)
 196         ret = dc->funcs->pExcludeClipRect( dc->physDev, left, top, right, bottom );
 197     else
 198     {
 199         POINT pt[2];
 200
 201         pt[0].x = left;
 202         pt[0].y = top;
 203         pt[1].x = right;
 204         pt[1].y = bottom;
 205         LPtoDP( hdc, pt, 2 );
 206         if (!(newRgn = CreateRectRgn( pt[0].x, pt[0].y, pt[1].x, pt[1].y ))) ret = ERROR;
 207         else
 208         {
 209             if (!dc->hClipRgn)
 210             {
 211                 dc->hClipRgn = CreateRectRgn( 0, 0, 0, 0 );
 212                 CombineRgn( dc->hClipRgn, dc->hVisRgn, 0, RGN_COPY );
 213             }
 214             ret = CombineRgn( dc->hClipRgn, dc->hClipRgn, newRgn, RGN_DIFF );
 215             DeleteObject( newRgn );
 216         }
 217         if (ret != ERROR) CLIPPING_UpdateGCRegion( dc );
 218     }
 219     GDI_ReleaseObj( hdc );
 220     return ret;
 221 }
 222
 223
 224 /***********************************************************************
 225  *           IntersectClipRect    (GDI32.@)
 226  */
 227 INT WINAPI IntersectClipRect( HDC hdc, INT left, INT top, INT right, INT bottom )
 228 {
 229     INT ret;
 230     DC *dc = DC_GetDCUpdate( hdc );
 231     if (!dc) return ERROR;
 232
 233     TRACE("%p %d,%d - %d,%d\n", hdc, left, top, right, bottom );
 234
 235     if(dc->funcs->pIntersectClipRect)
 236         ret = dc->funcs->pIntersectClipRect( dc->physDev, left, top, right, bottom );
 237     else
 238     {
 239         POINT pt[2];
 240
 241         pt[0].x = left;
 242         pt[0].y = top;
 243         pt[1].x = right;
 244         pt[1].y = bottom;
 245
 246         LPtoDP( hdc, pt, 2 );
 247
 248         if (!dc->hClipRgn)
 249         {
 250             dc->hClipRgn = CreateRectRgn( pt[0].x, pt[0].y, pt[1].x, pt[1].y );
 251             ret = SIMPLEREGION;
 252         }
 253         else
 254         {
 255             HRGN newRgn;
 256
 257             if (!(newRgn = CreateRectRgn( pt[0].x, pt[0].y, pt[1].x, pt[1].y ))) ret = ERROR;
 258             else
 259             {
 260                 ret = CombineRgn( dc->hClipRgn, dc->hClipRgn, newRgn, RGN_AND );
 261                 DeleteObject( newRgn );
 262             }
 263         }
 264         if (ret != ERROR) CLIPPING_UpdateGCRegion( dc );
 265     }
 266     GDI_ReleaseObj( hdc );
 267     return ret;
 268 }
 269
 270
 271 /***********************************************************************
 272  *           ExcludeVisRect   (GDI.73)
 273  */
 274 INT16 WINAPI ExcludeVisRect16( HDC16 hdc16, INT16 left, INT16 top, INT16 right, INT16 bottom )
 275 {
 276     HRGN tempRgn;
 277     INT16 ret;
 278     POINT pt[2];
 279     HDC hdc = HDC_32( hdc16 );
 280     DC * dc = DC_GetDCUpdate( hdc );
 281     if (!dc) return ERROR;
 282
 283     pt[0].x = left;
 284     pt[0].y = top;
 285     pt[1].x = right;
 286     pt[1].y = bottom;
 287
 288     LPtoDP( hdc, pt, 2 );
 289
 290     TRACE("%p %ld,%ld - %ld,%ld\n", hdc, pt[0].x, pt[0].y, pt[1].x, pt[1].y);
 291
 292     if (!(tempRgn = CreateRectRgn( pt[0].x, pt[0].y, pt[1].x, pt[1].y ))) ret = ERROR;
 293     else
 294     {
 295         ret = CombineRgn( dc->hVisRgn, dc->hVisRgn, tempRgn, RGN_DIFF );
 296         DeleteObject( tempRgn );
 297     }
 298     if (ret != ERROR) CLIPPING_UpdateGCRegion( dc );
 299     GDI_ReleaseObj( hdc );
 300     return ret;
 301 }
 302
 303
 304 /***********************************************************************
 305  *           IntersectVisRect   (GDI.98)
 306  */
 307 INT16 WINAPI IntersectVisRect16( HDC16 hdc16, INT16 left, INT16 top, INT16 right, INT16 bottom )
 308 {
 309     HRGN tempRgn;
 310     INT16 ret;
 311     POINT pt[2];
 312     HDC hdc = HDC_32( hdc16 );
 313     DC * dc = DC_GetDCUpdate( hdc );
 314     if (!dc) return ERROR;
 315
 316     pt[0].x = left;
 317     pt[0].y = top;
 318     pt[1].x = right;
 319     pt[1].y = bottom;
 320
 321     LPtoDP( hdc, pt, 2 );
 322
 323     TRACE("%p %ld,%ld - %ld,%ld\n", hdc, pt[0].x, pt[0].y, pt[1].x, pt[1].y);
 324
 325
 326     if (!(tempRgn = CreateRectRgn( pt[0].x, pt[0].y, pt[1].x, pt[1].y ))) ret = ERROR;
 327     else
 328     {
 329         ret = CombineRgn( dc->hVisRgn, dc->hVisRgn, tempRgn, RGN_AND );
 330         DeleteObject( tempRgn );
 331     }
 332     if (ret != ERROR) CLIPPING_UpdateGCRegion( dc );
 333     GDI_ReleaseObj( hdc );
 334     return ret;
 335 }
 336
 337
 338 /***********************************************************************
 339  *           PtVisible    (GDI32.@)
 340  */
 341 BOOL WINAPI PtVisible( HDC hdc, INT x, INT y )
 342 {
 343     BOOL ret = FALSE;
 344     DC *dc = DC_GetDCUpdate( hdc );
 345
 346     TRACE("%p %d,%d\n", hdc, x, y );
 347     if (!dc) return FALSE;
 348     if (dc->hGCClipRgn)
 349     {
 350         POINT pt;
 351
 352         pt.x = x;
 353         pt.y = y;
 354         LPtoDP( hdc, &pt, 1 );
 355         ret = PtInRegion( dc->hGCClipRgn, pt.x, pt.y );
 356     }
 357     GDI_ReleaseObj( hdc );
 358     return ret;
 359 }
 360
 361
 362 /***********************************************************************
 363  *           RectVisible    (GDI32.@)
 364  */
 365 BOOL WINAPI RectVisible( HDC hdc, const RECT* rect )
 366 {
 367     BOOL ret = FALSE;
 368     DC *dc = DC_GetDCUpdate( hdc );
 369     if (!dc) return FALSE;
 370     TRACE("%p %ld,%ldx%ld,%ld\n", hdc, rect->left, rect->top, rect->right, rect->bottom );
 371     if (dc->hGCClipRgn)
 372     {
 373         POINT pt[2];
 374         RECT tmpRect;
 375
 376         pt[0].x = rect->left;
 377         pt[0].y = rect->top;
 378         pt[1].x = rect->right;
 379         pt[1].y = rect->bottom;
 380         LPtoDP( hdc, pt, 2 );
 381         tmpRect.left    = pt[0].x;
 382         tmpRect.top     = pt[0].y;
 383         tmpRect.right   = pt[1].x;
 384         tmpRect.bottom  = pt[1].y;
 385         ret = RectInRegion( dc->hGCClipRgn, &tmpRect );
 386     }
 387     GDI_ReleaseObj( hdc );
 388     return ret;
 389 }
 390
 391
 392 /***********************************************************************
 393  *           GetClipBox    (GDI32.@)
 394  */
 395 INT WINAPI GetClipBox( HDC hdc, LPRECT rect )
 396 {
 397     INT ret;
 398     DC *dc = DC_GetDCUpdate( hdc );
 399     if (!dc) return ERROR;
 400     ret = GetRgnBox( dc->hGCClipRgn, rect );
 401     DPtoLP( hdc, (LPPOINT)rect, 2 );
 402     GDI_ReleaseObj( hdc );
 403     return ret;
 404 }
 405
 406
 407 /***********************************************************************
 408  *           GetClipRgn  (GDI32.@)
 409  */
 410 INT WINAPI GetClipRgn( HDC hdc, HRGN hRgn )
 411 {
 412     INT ret = -1;
 413     DC * dc;
 414     if (hRgn && (dc = DC_GetDCPtr( hdc )))
 415     {
 416       if( dc->hClipRgn )
 417       {
 418           if( CombineRgn(hRgn, dc->hClipRgn, 0, RGN_COPY) != ERROR ) ret = 1;
 419       }
 420       else ret = 0;
 421       GDI_ReleaseObj( hdc );
 422     }
 423     return ret;
 424 }
 425
 426 /***********************************************************************
 427  *           SaveVisRgn   (GDI.129)
 428  */
 429 HRGN16 WINAPI SaveVisRgn16( HDC16 hdc16 )
 430 {
 431     HRGN copy;
 432     GDIOBJHDR *obj, *copyObj;
 433     HDC hdc = HDC_32( hdc16 );
 434     DC *dc = DC_GetDCUpdate( hdc );
 435
 436     if (!dc) return 0;
 437     TRACE("%p\n", hdc );
 438
 439     if (!(obj = GDI_GetObjPtr( dc->hVisRgn, REGION_MAGIC )))
 440     {
 441         GDI_ReleaseObj( hdc );
 442         return 0;
 443     }
 444     if (!(copy = CreateRectRgn( 0, 0, 0, 0 )))
 445     {
 446         GDI_ReleaseObj( dc->hVisRgn );
 447         GDI_ReleaseObj( hdc );
 448         return 0;
 449     }
 450     CombineRgn( copy, dc->hVisRgn, 0, RGN_COPY );
 451     if (!(copyObj = GDI_GetObjPtr( copy, REGION_MAGIC )))
 452     {
 453         DeleteObject( copy );
 454         GDI_ReleaseObj( dc->hVisRgn );
 455         GDI_ReleaseObj( hdc );
 456         return 0;
 457     }
 458     copyObj->hNext = obj->hNext;
 459     obj->hNext = HRGN_16(copy);
 460     GDI_ReleaseObj( copy );
 461     GDI_ReleaseObj( dc->hVisRgn );
 462     GDI_ReleaseObj( hdc );
 463     return HRGN_16(copy);
 464 }
 465
 466
 467 /***********************************************************************
 468  *           RestoreVisRgn   (GDI.130)
 469  */
 470 INT16 WINAPI RestoreVisRgn16( HDC16 hdc16 )
 471 {
 472     HRGN saved;
 473     GDIOBJHDR *obj, *savedObj;
 474     HDC hdc = HDC_32( hdc16 );
 475     DC *dc = DC_GetDCPtr( hdc );
 476     INT16 ret = ERROR;
 477
 478     if (!dc) return ERROR;
 479
 480     TRACE("%p\n", hdc );
 481
 482     if (!(obj = GDI_GetObjPtr( dc->hVisRgn, REGION_MAGIC ))) goto done;
 483     saved = HRGN_32(obj->hNext);
 484
 485     if ((savedObj = GDI_GetObjPtr( saved, REGION_MAGIC )))
 486     {
 487         ret = CombineRgn( dc->hVisRgn, saved, 0, RGN_COPY );
 488         obj->hNext = savedObj->hNext;
 489         GDI_ReleaseObj( saved );
 490         DeleteObject( saved );
 491         dc->flags &= ~DC_DIRTY;
 492         CLIPPING_UpdateGCRegion( dc );
 493     }
 494     GDI_ReleaseObj( dc->hVisRgn );
 495  done:
 496     GDI_ReleaseObj( hdc );
 497     return ret;
 498 }